"Remove old versions" during installation

[khzimmer at posteo.de]

PS: Details: If I remember correctly there was a change in autumn 2019: 
before LuaTeX, then LuaHBTeX.

Also there was a change in the version of the microtype package at the 
same time.

I am not sure which of the changes caused the incompatibility, I was 
able to reproduce:

Changing the text run width for one paragraph (or within a paragraph, 
for one line) resulted in line breaks happening at other places that in 
the previous version. :(

For me that was a shock, as I previously had trusted the "rule" that it 
would be possible to achieve the same results with new versions as 
achieved with old versions.


Am 29.01.2023 16:13 schrieb khzimmer at posteo.de:
> Hi Uwe,
> 
> since we had observed frightening incompatibilities between past
> versions of TeX Live, it would be bad to add such an option without
> providing an explicit warning:
> 
> "By removing your older version(s) of TeX Live it might happen that
> you will NOT be able to produce the same PDFs with the new version
> that you achieved by using that old version."
> 
> Karl-Heinz
> 
> Am 29.01.2023 12:04 schrieb Uwe Ziegenhagen:
>> Hi,
>> 
>> I was just asked by a user, if the TeX Live installation routine could
>> also include an option to remove older versions.
>> 
>> Something in the following way:
>> 
>> The installation of TeX Live 2022 was successful? Shall old
>> installations be removed?
>> 
>>  [ x ] 2020 remove
>> 
>>  [ x ] 2021 remove
>> 
>> I think, it could be a good idea, only few probably need the old
>> installations.
>> 
>> Uwe
>> 
>> --
>> 
>> Dr. Uwe Ziegenhagen
>> 0179-7476050
>> <http://www.uweziegenhagen.de [1]>
>> 
>> Links:
>> ------
>> [1] http://www.uweziegenhagen.de